IGN spoke with Harris to ask if the erstwhile Music Meister might reprise his animated Batman: The Brave and the Bold character for the two-part Supergirl and Flash event, though the actor could only acknowledge having heard of the crossover; not participating.

I’ve heard about it, that’s as much as it’s been. I did the Music Meister in a recording booth in L.A. … fifteen years ago, or something? And then it comes out a year later. It was a fun episode! A good thing to do.

If nothing else, rumors of Joss Whedon’s participation had at least reached Harris, though both he and the interviewer doubted their veracity, before Harris offered a final “we’ll see.”. Also worth noting, it was in 2009 that Batman: The Brave and the Boldintroduced Harris as the “Music Meister,” not “fifteen years ago” as the actor suggests.

Back in early September, Arrow-verse executive producer Greg Berlanti said they’d only just begun the process of clearing music and drafting original songs, also addressing reports of someone famous like Lin-Manuel Miranda taking part:

[laughs] I would say, pretty close. I can’t say yet because we don’t have a deal yet, but I did speak to someone we’re really excited about. There are some writers I’m incredibly excited to work with.

Our money’s still on Supergirl’s Mr. Mxyzptlk facilitating the musical event more-so than Music Meister, but should Flash and Supergirl still reprise the character, even without Harris? Stay tuned for the latest.